I will be on Carnival Splendour on September 11th, 2008. I would like to know where exactly the ship will dock and how to get to the city of Livorno by myself. Thank you. Moïka

The first paragraph of this document, and the related pic, should answer your question.
www.ftroute.com/liv_fir_liv.htm

Thank you for the information. But why can't I walk to town? And is therer a fare for the shuttle bus from the pier to Piazza Grande?

Walking to town. It will really depend uopn where your ship actually ends up docking. If it is at the bottom pier in the referenced picture, then you should be able to walk. Any other locations you will be in the middle of a very busy port and they probably will not let you walk.

The shuttle bus to Piazza Grande should be free.

Hi Moika,
Welcome to cruise-chat.
Yes, there is a free shuttle to town, if I remember correctly it was free, but the driver appreciates a tip. The staff on the ship doesn't push any of the free shuttles.
It is worth going there. There's a lot of shopping.
Have a Great Time.
Sandy p